[gmx-users] Electric potential over the membrane

Itamar Kass ikass at cc.huji.ac.il
Sat Nov 22 10:48:01 CET 2003


    I guess I do not understand a basic issue here, why use mV/nm?

At 10:38 AM 11/22/2003, you wrote:
>On Sat, 2003-11-22 at 10:22, Itamar Kass wrote:
> >     O.K. David, no petty, what should I do to get an electric fields ad
> > described in by Robertson & Tieleman at "The molecular basis of voltage
> > gating of OmpF porin" (Biochem Cell Biol. 2002;80(5):517-23. ) of about 
> 300mV?
> >           thanks, Itamar.
>
>haven't read that, but if your membrane is, say, 3 nm wide, and you want
>a potential of 300mV, then 3 nm times 100 mV/nm would give you that,
>wouldn't it?
>
> >
> > >On Sat, 2003-11-22 at 09:01, Itamar Kass wrote:
> > > > Hi all,
> > > > It's a shame to me, but although I looked at the manual few times, I
> > > did not
> > > > understand how to used an electric potential.  I want to enter to my
> > > simulation
> > > > of peptide in a membrane an electric potential of ~100mV in the z
> > > direction (the
> > > > membrane normal).  My question is about the units, when I put
> > > > ;Electric field
> > > > E_z = 1  0.1  0.0
> > > > in my mdp file, does I get 100mV potential in my simulation?
> > >no, you get 100 mV/nm electric field.
> > >
> > > >    Thanks, Itamar.
> > > >
> > > >
> > > >
> > > > ********************************************
> > > > Computers are like airconditioners... They don't work well with Windows
> > > > open.
> > > > ********************************************
> > > >
> > > > ===========================================
> > > > | Itamar Kass
> > > > | The Alexander Silberman
> > > > | Institute of Life Sciences
> > > > | Department of Biological Chemistry
> > > > | The Hebrew University, Givat-Ram
> > > > | Jerusalem, 91904, Israel
> > > > | Tel: +972-(0)2-6585146
> > > > | Fax: +972-(0)2-6584329
> > > > | Email: ikass at cc.huji.ac.il
> > > > | Homepage:
> > > http://www.ls.huji.ac.il/~membranelab/itamar/itamar_homepage.html
> > > > ============================================
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> > >--
> > >David.
> > >________________________________________________________________________
> > >David van der Spoel, PhD, Assist. Prof., Molecular Biophysics group,
> > >Dept. of Cell and Molecular Biology, Uppsala University.
> > >Husargatan 3, Box 596,          75124 Uppsala, Sweden
> > >phone:  46 18 471 4205          fax: 46 18 511 755
> > >spoel at xray.bmc.uu.se    spoel at gromacs.org   http://xray.bmc.uu.se/~spoel
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> >
> >
> > ********************************************
> > Computers are like airconditioners... They don't work well with Windows
> > open.
> > ********************************************
> >
> > ===========================================
> > | Itamar Kass
> > | The Alexander Silberman
> > | Institute of Life Sciences
> > | Department of Biological Chemistry
> > | The Hebrew University, Givat-Ram
> > | Jerusalem, 91904, Israel
> > | Tel: +972-(0)2-6585146
> > | Fax: +972-(0)2-6584329
> > | Email: ikass at cc.huji.ac.il
> > | Homepage: 
> http://www.ls.huji.ac.il/~membranelab/itamar/itamar_homepage.html
> > ============================================
> >
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>--
>David.
>________________________________________________________________________
>David van der Spoel, PhD, Assist. Prof., Molecular Biophysics group,
>Dept. of Cell and Molecular Biology, Uppsala University.
>Husargatan 3, Box 596,          75124 Uppsala, Sweden
>phone:  46 18 471 4205          fax: 46 18 511 755
>spoel at xray.bmc.uu.se    spoel at gromacs.org   http://xray.bmc.uu.se/~spoel
>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
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********************************************
Computers are like airconditioners... They don't work well with Windows
open.
********************************************

===========================================
| Itamar Kass
| The Alexander Silberman
| Institute of Life Sciences
| Department of Biological Chemistry
| The Hebrew University, Givat-Ram
| Jerusalem, 91904, Israel
| Tel: +972-(0)2-6585146
| Fax: +972-(0)2-6584329
| Email: ikass at cc.huji.ac.il
| Homepage: http://www.ls.huji.ac.il/~membranelab/itamar/itamar_homepage.html
============================================ 




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